Process for the production of lacquers and lacquer starting materials containing artificial resins



I hitherto existing can Patented Feb. 1937 rnocsss FOB 'r QUERS m an PRODUCTION or Lao- LACQUEB sraarme'ma'm. mas commune aarmcranansms No mam; Application March 21, issa-semi No. 661,998. In GermanyjNovernbcr comma (cam-+26) The invention" relates to the production of artificial resins,

filling. lacquers, which contain particularly phenol-formaldehyde artificial reshis, aswell as fillers,. colouringmatters and the like and particularlyto the production of lacquer starting materials of the aforesaid kind, from.

be prepared with the which lacquer solutions can aid of suitable solvents. The method hitherto adopted for preparing lacquer solutions from artificial resin lacquers, was to dissolve the artificial resins, of the resol or novolac typ in. the presenoeot substances,

containing reactive methylene groups, in suitable solvents, such as alcohol, acetone and the like'and to add to these solutions insoluble fillers or every kind, such as white lead, zinc oxide, kaolin, blanc fixe, filling-up etc. and to treat the mixtures in ball-mills or other suitable apparatus until the fillers were'extremely'finely ground and the lacquers could be regar ed as being homogeneous.

These ,processes have as one oi! their disadvantages, that they require a considerable timeuntil the requisite fineness of grain is attained.

Moreover, on standing, this out from the lacquer after standing for some that it can only be comminuted In addition the disadvantage exists that the finished lacquer solution, which deposit oration, losses or the easily volatile solvents ocour and there is an attendant risk ,oi'fire.

Moreover the lacquer coatings prepared from I these lacquer solutions are notparticularly sat-' isiactory. The object or this invention is to provide'aprocess, with the aid of which the disadvantages advantages canbe; obtained. 1

.According to .the'invention a material is first prepared.

lacquer This lacquer starting material, which'contains the-artificial resin employed in a soluble and hardena'ble condition or or being hardened by'the addition or hardening agents,'and also fillers, colouringmatters and other solid and insoluble materials employed with these filling lacquers, can

plication to whereby the .oellent properties and are far superior to those hitherto prepared. plt has nowbeen ot resins and the found that m the substrate necessary for the lacpressuretreatment is preferably such that;

a solid. hard deposit. settime becomes so with .difiiculty;

solutions have to be prepared and transported as required, whereby, owing to evap-'. of particularly be overcome and certain of agglomerated, particie's' not completely ini soluble capable be worked up without difllculty in the usual solvents at the place of 3%:

a homogeneous lacquer solution,

hardened lacquer coatings show e'xwhich also show an extraordinarily high resist I ance to alkalies and other chemicals. treatment 5 ;mass is introduced into the solventrreadily forms it quer coatings as well as colouring materials. D

erably with all 01 however, with those substrate, which bring about the usual disturbances, under the application or pressure and .heat. for example by a kneading s process at elevated temperatures, the substances become so finely distributed in the resin that,,

on dissolving the product, the substrate. remains finely and homogeneously suspended in-the -lac-'- quer. The resin, during the kneading process, -10 penetrates into the grains of the colouring 1 or oi. the filler, so

and finely distributed. Thetemperature' during the resin is liquid, without passing over into its final condition. The duration and temperature of the pressure treatment are to be so selected that the volatile constituents, water, tree phenols, aldehyde and the like, can escape. The use or. high pressures is advantageous in order to ensure more periect pe'netrationz or; the resin which has become'soit 'or liquid into the The process-may. becarried out in a mast'i'cator or with the aid? oi kneading rollecsa This process is withiadvantage'. carried outjon a, pair or heated rollers in which'jthe speed of the rollers is difierent, wherebycompre'S' -E i sing and frictional effects: are obtained. The

sible it. the previously finely powdered and purely mechanically divided mixture is-passed throughheated .nozzles under pressure, whereby the advantage is obtained that the operation need not be carried out in batches but continuously and u that the product obtained always possesses uni-'- form-properties. Y I v when operating according to the process or. this inventionthe iormation' of lamps, consisting pregn'ated by 'reslnjp'r ram solution, on dis'solv-f ing the lacquers, is

merely mechanically mixed without-the application of heat and pressure; ,Such mixing yields a, product, which is with difiiculty, or only soluble to a lacquer. Theiprocess oi the invention, when using resols, i.- e. ,hardenable artificial resins, yields lacquer coatings, which are notonly distinguished by a higher tastness to light, but

The masses prepared accor i 's to the 'inveh tion can be comminuted or ground; Thepowdered these substances,inanycase,-

that, .on dissolving in suitable. solvents, the insoluble grains become loosened high pressures is] rendered s exclud'ed. This lump r m-1;- I tion cannot be avoided if 'the initia'lproducts are 1 ,a homogeneous suspension and solution without lump formation and avoiding any tedious wetgrinding process. In the suspended and dissolved condition the lacquer solutions, for example the solutions in spirits, possess the surprising property 01' remaining permanently practically homogeneous, and that practically no hard deposit settles out on standing so that the homogeneous suspension is again produced by simple stirring.

What I claim is: 1

l.' A process for the production of lacquers and lacquer starting materials 01. filling lacquers free from material forming hard non-suspenslble deposits and containing artificial resin, which comprises subi ecting a resol resin to heat and pressure in the presence of an insoluble solid granular filling material and in the substantial absence of solvents so that the resol is plasticized and caused to penetrate into the grains of the filling material while permitting volatile constituents to escape, terminating the operation of the heat and pressure before a substantial change 01 the resol occurs, and dissolving the resol in a solvent therefor in order to prepare a lacquer solution having the grains of filling material distributed and suspended therein.

2. A process for the production of lacquers and lacquer starting materials of filling lacquers free from material forming hard non-suspensible deposits and containing artificial resin which comprises subjecting a soluble and hardenable artificial resin to heat and pressure in the presence of an insoluble'solid granular filling material and in the substantial absence of solvents so that the resin is plasticized and ceased to penetrate into the grains of the filling material, reducing the heat and pressure before a substantial change of the resin occurs, and dissolving the resin in a solvent therefor in order to prepare a lacquer solution having the grains of filling material distributed and suspended. therein.

RICHARD Hnssmr. 

